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b. Vent room directly to the outdoors. Refer to National Fuel Gas Code, ANSI Z223.1 1992, Section 5.3. c. Install a lower BTU/Hr heater, such as a 21,000 BTU/Hr, to make the area an unconfined space. If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, then the space is an unconfined space. You will need no additional fresh air ventilation for an unconfined space. LOCATION OF FIREBOX Carefully select the best location for installation of your built-in unvented firebox. The following factors should be taken into consideration: • Clearance to side wall, ceiling, woodwork and windows. • Location must not be affected by drafts caused by kitchen exhaust fans, return air registers for forced air furnaces/air conditioners, windows or doors. • Installation must provide adequate ventilation and combustion air. • Do not install this firebox in a sleeping room or bathroom. • Location should be out of high traffic areas and away from furniture and draperies due to heat from firebox. • Never obstruct the front opening of the unvented firebox or restrict the flow of combustion and ventilation air. • Minimize modifications to existing construction. See Figure 1 for location suggestions. WARNING: MAINTAIN MINIMUM CLEARANCES. Do not install in the vicinity where gasoline or other flammable liquids may be stored. The unvented firebox must be kept clear and free from these combustible materials. CAUTION: HEATERS CREATE WARM AIR CURRENTS. THESE CURRENTS MOVE HEAT TO WALL SURFACES NEXT TO HEATER. INSTALLING HEATER NEXT TO VINYL OR CLOTH WALL COVERINGS OR OPERATING HEATER WHERE IMPURITIES IN THE AIR (SUCH AS TOBACCO SMOKE) EXISTS, MAY DISCOLOR WALLS. WARNING: DO NOT ALLOW FANS TO BLOW DIRECTLY INTO THE FIREPLACE. AVOID ANY DRAFTS THAT ALTER BURNER FLAME PATTERNS. WARNING: DO NOT USE A BLOWER INSERT, HEAT EXCHANGER INSERT OR OTHER ACCESSORY NOT APPROVED FOR USE WITH THIS FIREPLACE. Not to Scale Figure 1 Clearances WARNING: DO NOT INSTALL THESE BUILT-IN UNVENTED FIREBOXES IN SLEEPING QUARTERS, OR IN RECREATIONAL VEHICLES. WARNING: DO NOT INSTALL THESE APPLIANCES: • WHERE CURTAINS, FURNITURE, CLOTHING OR OTHER FLAMMABLE OBJECTS ARE LESS THAN 42" FROM THE FRONT OF THE UNVENTED ROOM HEATER. • IN HIGH TRAFFIC AREAS. • IN WINDY OR DRAFTY AREAS. Ensure the minimum clearances shown in Figures 2 and 3 are maintained. Left and right clearances are determined when facing the front of the firebox. Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a fire hazard. Sidewall clearances: The sides of the firebox opening must be at least 16" from any combustible wall (Figure 2). Optional Hearth Extension Figure 2 Ceiling clearance: The ceiling must be at least 40" from the top of the firebox opening (Figure 2). Noncombustible material: Noncombustible materials, such as slate and marble, must be at least ..." thick and may be used without restriction above the firebox opening, to the sides or as a h...

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